Facile preparation of hydrogenated graphene by hydrothermal methods and the investigation of its ferromagnetism

In this paper, a hydrothermal approach is utilized for the first time in integrating graphene oxide (GO), acetic acid (HAc) and nickel foam to prepare hydrogenated graphene (HG). There are two primary aims of this study: one is to ascertain the structure of the as-prepared HG, and the other one is to investigate the ferromagnetism of the HG. Under hydrothermal conditions, GO was reduced and hydrogenated by HAc, while the nickel foam served as a catalyst. This work provides a novel and facile route for the synthesis of hydrogenated graphene, which may lead to the application of hydrogenated graphene in spin electronic devices.     

Upper Bound Shakedown Analysis of Plates Utilizing the C1 Natural Element Method

This paper proposes a numerical solution method for upper bound shakedown analysis of perfectly elasto-plastic thin plates by employing the C1 natural element m...     

Heat transfer characterization and improvement in an external catalyst cooler fluidized bed

Gas-solid fluidized beds have been widely used in heat transfer processes,and so there have been many studies focused on increasing heat transfer in such units....     

Vibro-impact analysis of two adjacent cantilever beams

Nonlinear Dynamics - This study analyzes the vibro-impact behavior of two adjacent cantilever beams subjected to vibration generated by applying harmonic excitation to their rigid base. For the...     

一套预测冰面上汽车牵引力的模型

根据传热学中的热平衡原理及冰的摩擦经理论，建立了冰面汽车牵引力的预测模型。研究表明：所建立的理论模型比已有的模型更接近实际，从摩擦学角度系统分析了汽车工作条件和环境因素以及表面粗糙度等对牵引力的影响，提出了今后研究中有待解决的几个问题。     

双层加筋圆柱壳在不同舷间连接形式下的声辐射性能分析

论文用解析法推导得出了双层加筋圆柱壳的两种舷间连接形式-实肋板和托板的反力表达式,其中实肋板的振动形式分别采用三种振动方程近似表示-考虑板的面内面外振动、仅考虑板的面内振动、仅考虑板的面内准纵波振动,托板的振动形式也分别采用三种振动方程近似表示-考虑板的面内振动、仅考虑板的面内准纵波振动、近似成杆的纵向振动,数值分析对比得出了不同方法的偏差值;并对不同连接方式的双壳声辐射性能进行了比较,得出结论当托板铺满整个环面时,结构与环肋板相似,辐射性能也与环肋板连接相似.     

CALCULATION METHODS ON CRACK RESISTANCE CAPACITY OF CONNECTION COMPOSED OF CSSEUHSC COLUMNS AND SEC BEAMS

In order to investigate the calculation methods on crack resistance capacity of connection composed of cross shaped steel encased ultra high strength concrete (CSSEUHSC) columns and steel encased concrete (SEC) beams under cycle loads, six interior connection specimens were tested in the laboratory. A discussion on the crack resistance capacity was presented. Calculation methods of crack resistance capacity were deduced based on the experimental case and calculation results were in good agreement with the experimental results. The research results indicated that parameters of connection composed of CSSEUHSC columns and SEC beams with better crack resistance performance may be referred for engineering application.     

基于小波变换阈值法处理光纤陀螺信号噪声

小波具有多分辨率分析特性,利用小波变换阈值滤波可以有效地处理光纤陀螺信号的噪声。具体的仿真实验分析比较表明,小波变换阈值滤波可以有效地剔除光纤陀螺的信号噪声;与传统的数字低通滤波方法相比,去噪效果更好。利用Allan方差法并通过最小二乘拟合可得到陀螺信号噪声中各误差源的幅度;通过比较滤波前后的各误差系数的具体数值,进一步证实了小波变换阈值滤波的有效性;并指出通过小波分析可以显示出陀螺信号中低频噪声的发展趋势。     

压缩载荷下孔隙结构变化的CT实验研究

为了研究孔隙对岩石力学性能的影响,利用自制的孔隙物理模型,通过单轴压缩和CT扫描实验研究了受载条件下孔隙率对岩石孔隙结构的演化及其对外部物理力学性能的影响,得到了不同加载阶段和不同CT观察尺度下孔隙模型的裂纹扩展规律以及孔隙和固体介质的损伤变化情况. 实验结果表明：孔隙模型在受载条件下裂纹主要发生在峰值荷载之后,主裂纹大都集中在孔隙密集的地方且伴随许多细小裂纹的产生;峰值载荷前出现了少数微裂纹,微裂纹的产生与演化主要发生在孔隙周边.     

探地雷达测定地基土含水量的实验研究

利用室内模型槽,采用探地雷达开展了测定地基土含水量的室内实验研究。通过对探地雷达反射波法测定的介电常数和烘干法测定的含水量之间的曲线拟合,提出了实验用粉土的含水量与介电常数之间的经验公式。与实测含水量的对比分析表明,Topp公式在一定含水量范围内有良好的适用性,而本文提出的经验公式较Topp公式具有更宽的含水量适用范围和更高的预测精度;针对不同类型土建立相应的含水量和介电常数之间的经验公式是必要的,将有助于提高探地雷达测定地基土含水量的精度。